v4.2.1

What's Changed

• Bump actions/setup-node from 2 to 4 by @dependabot in #616
• Bump actions/checkout from 4.1.7 to 4.2.1 by @dependabot in #617
• Pin minimum version to Node.js v20 by @sr229 in #619

Full Changelog: v4.2.0...v4.2.1